.dhz h1{
    text-align: center;
}
.dhz h4 video{
    height: 700px;
    width: 500px;
}
.am img{
    height: 700px;
    width: 500px;
}


.dhz h5 img{
    height: 400px;
    width: 500px;
}
.kle video{
    height: 400px;
    width: 500px;
}
.kle audio{
    width: 450px;
}

.dh{
   background-image: url(./首页背景图.jpg);
    text-align: center;
    height: 900px;
    
}